Safer® Brand offers two types of Diatomaceous Earth. Diatomaceous Earth Ant & Crawling Insect Killer can be used to fight a variety of crawling insects both inside and outside of your home. As a mechanical killer, it shreds insects' exoskeletons as they move across it, killing them within 48 hours. It’s also OMRI Listed®. Food Grade Diatomaceous Earth on the other hand, is a natural anti-caking agent designed to be used as an animal feed additive.